<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/lodash.js/4.17.21/lodash.min.js"></script>
<style>
    ul{
        width: 300px;
    }
    li{
        height: 40px;
        border-bottom: 1px solid #000;
    }
</style>

</head>
<body>
    <div>
       <ul>
        <li>1</li>
        <li>2</li>
        <li>insomnin</li>
        <li>yyidd</li>
        <li>45</li>
        <li>54</li>
        <li>78</li>
        <li>86</li>
        <li>77</li>
        <li>66</li>  
    </ul>  
    </div>
    <script>
       const oLis = document.querySelectorAll("ul li");
      function enter() {
        console.log(1);
        this.style.background = "antiquewhite";
      }
        function leave(){
            console.log(2);
            this.style.background = "";
        }

        const throttleEnter = _.throttle(enter,30,{
            trailing:false,
            leading:true,
        });
        const throttleLeave =leave;

        oLis.forEach((item)=>{
        item.onmouseenter = throttleEnter;
        item.onmouseleave = throttleLeave;
        });
    </script>
</body>
</html>